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Abstract

This paper describes an experimental investigation of the coagulation of particles in oil under the action of an a.c. electric field. The investigation is carried out to acquire fundamental data to develop an electrostatic liquid filter with higher performance. The coagulation process of spherical silica particles is observed using a video-microscope with a CCD (charge coupled device) camera under various conditions and the effects of some mechanical factors such as the strength of the a.c. electric field, the velocity gradient of flow and so on are examined. The electric field is applied perpendicularly to the flow and particles are aligned in the same direction as the a.c. electric field by its action. The experiment shows that a certain frequency of a.c. electric field and a certain velocity gradient of flow exist which render the rate of coagulation maximum. It is pointed out that an interaction between the a.c. electric field and the flow field has a significant influence on the coagulation process.

Keywords

electrostatic filtration a.c. electric field coagulation non-aqueous system electrical double layer

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Coagulation of particles in oil by an a.c. electric field (fundamental experiment)

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